Sipper cap



FIG. 1 is a top rear perspective view of a sipper cap.

FIG. 2 is a top front perspective view of the sipper cap.

FIG. 3 is a rear view of the sipper cap.

FIG. 4 is a front view of the sipper cap.

FIG. 5 is a left side view of the sipper cap.

FIG. 6 is a right side view of the sipper cap.

FIG. 7 is a top view of the sipper cap; and,

FIG. 8 is a bottom view of the sipper cap.

The broken lines illustrating portions of the sipper cap form no part of the claimed design. 

CLAIM The ornamental design for a sipper cap, as shown and described. 